lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric EZGO
Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV.



Post New Thread  Reply
Thread Tools Display Modes
Unread 05-01-2015, 03:24 PM   #1
Gone Wild
 
DaveTM's Avatar
 
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 2,516
Default Yet....one more battery question......

Ok, here's the deal. About a month ago I opened up my wallet....chased out a big pile of moth's, and sprang for a really nice ScottyB digital battery meter...with the fancy switch so I could also monitor my aux 12-V winch\light battery. Nice stuff BTW. No more old style red line deal to "guess" with.

However, in reading the documentation that came with it...it stated that if I am under a load....like coming up a hill, should the meter drop to 42-V (I have a 48-V system, 8, 6-V T-105's). Now, I just charged my batt's and drove over my hill....and on the way back up....not a steep hill.....the volt meter dropped to 42-V on a few occasions. My water levels are all good...checked 'em the other day...and my run times for a charge are normal.

So....what's up???
DaveTM is online now   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Unread 05-01-2015, 05:30 PM   #2
Over This Interview Is...
 
cgtech's Avatar
Yamaha
 
Join Date: Jun 2012
Location: AZ
Posts: 11,852
Default Re: Yet....one more battery question......

Battery voltage drops under load, the higher the load, the more voltage "sags". They dont stay at any exact voltage until they are dead. It sounds normal to me. You could drive over the same hill several times, each time switching a dvm to each battery individually, checking for one that drops significantly more than the rest.
cgtech is offline   Reply With Quote
Unread 05-01-2015, 05:49 PM   #3
BGW Sponsor
 
scottyb's Avatar
E-Z-GO
 
Join Date: Dec 2007
Location: Southern California
Posts: 66,837
Default Re: Yet....one more battery question......

A drop of 6v can happen without big concern if the pack is not at 100% at the time of the drop.
In other words, the load of a given task is relative to amount of reserves your pack has.
P.S.
I hope those moths are okay
scottyb is offline   Reply With Quote
Unread 05-01-2015, 07:27 PM   #4
Techno-Nerd
 
JohnnieB's Avatar
E-Z-GO
 
Join Date: Jun 2011
Location: West Virginia
Posts: 14,481
Default Re: Yet....one more battery question......

Dave, IIRC, you have a high torque motor fed by a 650A controller and turning fairly taller tires, so your setup has the potential of dropping the pack voltage by at least 10V. In fact, under the right load and speed conditions, you probably have the capability of dropping the pack to 1.5VPC or less. (36.0V for a 48V pack)

Ideally, a 48V pack will drop about 1.5V for every 100A of current being drawn from it, but that is based on the nominal internal resistances of the batteries alone while in real life, there is also resistance in the high current cables, F/R contacts, main solenoid contacts and all the cable connections, so it drops more.

The lowest I've (knowingly) dropped my 42V pack down to was 32.8V (1.56VPC) while climbing a steep hill. I was doing about 8.5 MPH, so the motor was turning about 2,000 RPM and was drawing close to 400A (391A to be exact).

Record a data log file and it'll show the relationship between amps being drawn and the pack voltage drop.
JohnnieB is offline   Reply With Quote
Unread 05-01-2015, 07:39 PM   #5
BGW Sponsor
 
scottyb's Avatar
E-Z-GO
 
Join Date: Dec 2007
Location: Southern California
Posts: 66,837
Default Re: Yet....one more battery question......

Excellent memory JB - I'm impressed
scottyb is offline   Reply With Quote
Unread 05-01-2015, 07:53 PM   #6
Gone Wild
 
DaveTM's Avatar
 
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 2,516
Default Re: Yet....one more battery question......

Hey...thanks guys for all of your replies. I really do appreciate 'em. But...I was just sitting here thinking.....and that's a dangerous thing to do........but my 59 year old eyes were looking at that gauge while I was bumping up the hill....so (like I said...thinking...) maybe it was actually saying 47-V and not the 42-V I first posted.

I'll give it a run when I get back home on Sunday and let you know. Of course....I realize the suspense will keep you riveted until then.

I'd go check it now....but I got undies to wash!!
DaveTM is online now   Reply With Quote
Unread 05-04-2015, 09:29 AM   #7
Gone Wild
 
DaveTM's Avatar
 
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 2,516
Default Re: Yet....one more battery question......

Well, I got back. Actually....I was in West Virginia at "the track" for the "running of the Kentucky Derby." Yes....I know Kentucky is a bit more south.....but my cart ran out of battery juice!! Actually, a bunch of us went to Wheeling downs to not only watch the derby, but to place bets on the derby and afterwards, place our large $2 bets on the local races. I place them based upon the statistic and my wife makes hers based upon how "pretty" the horse looks. At the end of the night.....she always comes out ahead. Yup...she is up like $12 and I've lost $15. High rollers we are!!

Anyway...this am I "hauled" twice, two of my Silverado tires from the back of my house's shed to the front as I'm finally going to summer mode. The meter did in fact drop to 39-V on the up hill, but at rest went to 51.6-V again. Both times.

Now, I am currently running 4-ga. wiring with crimped (not soldered...just crimped) terminals. I keep telling myself I'm going to buy the components and have my B-I-L make my upgrades.....but I've lost my "wait patience" with his "I'll get to this next". So...with that, I need some guidance from ScottyB. I believe from looking at your web site that I want to purchase EZgo Kit #2A SW202. Now, if I read this right it has the 3/8' lugs for the 4 lugs that attach to the SD reversing contactors ONLY. (Not 3/8" lugs on all ends) BTW, my SD contactor is located where the old switch was, so I assume all wires in your package are long enough to do the job...and these are all 2-ga. wiring.

I've needed to do this upgrade for over a year.....so.....


thanks much.

Dave
DaveTM is online now   Reply With Quote
Unread 05-06-2015, 04:12 AM   #8
Gone Mad
E-Z-GO
 
Join Date: Oct 2009
Location: Buford, GA
Posts: 6,942
Default Re: Yet....one more battery question......

After a hard run, feel the connections. If there's no heat, they are good enough.

The soldered vs. crimped connection debate will never end. If you're starting from scratch or replacing anyway, I'd go with soldered, but that's me. I made my own, and chose silver solder and 2 gauge welding cable.

Again, if you have excess resistance, it will get warm/hot. If not, you're probably kewl.
yurtle is online now   Reply With Quote
Unread 05-06-2015, 07:33 AM   #9
Gone Wild
 
DaveTM's Avatar
 
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 2,516
Default Re: Yet....one more battery question......

Quote:
Originally Posted by yurtle View Post
After a hard run, feel the connections. If there's no heat, they are good enough.

The soldered vs. crimped connection debate will never end. If you're starting from scratch or replacing anyway, I'd go with soldered, but that's me. I made my own, and chose silver solder and 2 gauge welding cable.

Again, if you have excess resistance, it will get warm/hot. If not, you're probably kewl.
I've been in touch with ScottyB. I'm going with his 2-ga. set. I have some "honey do" things this morning, then I will take a peek at my cart to make sure I have it right and order a set from him. Making my own is possible....but the soldering part is not with me. I usually end up with a 2nd degree burn of some type when I mess with any type of heat. When I was a teenager I attempted to cast my own lead round balls for black powder shooting. After the second try and a "hot one" dropped into my boot....I figured it was God's way of saying.....don't do stuff like this for a living son.....there are other guys who have this talent. Your not one of 'em.
DaveTM is online now   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric EZGO


Thread Tools
Display Modes


Similar Threads
Thread Forum
Another battery question Electric EZGO
Switching lights from battery pack to stand alone battery question Electric EZGO
Battery Question Electric Club Car
Another battery question Electric EZGO
battery question?? Electric EZGO


All times are GMT -5. The time now is 08:26 AM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.